Sounds can transport us. The trumpet of an African forest elephant can take us to a noisy night in a reserve in the Central African Republic. The spiraling, alien trills of an Alaskan bearded seal can whisk us to the frigid Arctic Ocean. And the bell-like warble of the shiny black Kauai Oo can carry us back to Hawaii, to a time that no longer exists. The bird is now gone. Extinct. But thanks to a 1975 audio recording, its melodies live on.